St. Thomas Orthodox Syrian Church is located in the Cantonment of Prayagraj (formerly Allahabad) in Uttar Pradesh in north India. The wooden building was completed in 1889 as the Garrison Church. In 1948 it was renamed as the St. Thomas Orthodox Syrian Church. The church is a parish in the Diocese of Delhi, Malankara Orthodox Syrian Church.
The church was built by Horace Barnet, a military engineer. It was consecrated as the St. David's Garrison Church on 8 February 1889 by the Bishop of Calcutta Ralph Johnson. The church was dedicated to Queen Victoria in 1897. On 1st April 1948, after Indian independence it was transferred to the Indian Church Trustees, Calcutta. Later, it was transferred to the Malankara Syrian Church and given its current name, St. Thomas Orthodox Syrian Church.
The building is constructed of wood.
The parish has several activities for the parishioners.